i lo选项告诉tcpdump要侦听哪个接口(在这个例子中要侦听回送设备)。

The -i lo option tells tcpdump what interface to listen on (the loopback device, in this case).

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然后我们进行循环，重新扫描 SCSI 总线（通过将命令回送到 /proc pseudo-filesystem 中的特殊文件，并调用 devfsd ），直到出现根设备（我的例子中为 /dev/sda1）。

We then loop, rescanning the SCSI bus (by echoing a command to a special file in the /proc pseudo-filesystem and calling devfsd) until the root device (/dev/sda1 in my case) is present.

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请求将被后端接收到，然后回送一个 JSON 响应文件，其中含有设备请求的数据。

The request will be received by the back end, which in turn will send back a JSON response file containing the requested data to the device.

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